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From: wa2ise
Newsgroups: rec.radio.amateur.misc

Subject: TR2400 repair notes, unwanted noise, low RX, display & keyboard

Keywords:tr2400

Message-ID: <1991Dec18.174853.23184
Date: 18 Dec 91 17:48:53 GMT

Sender: news
Organization: AT&T Bell Laboratories

Lines:96



The following are several articles crossposted from packet on the TR2400:



copied from packet:

 Msg# TSF  Size #Rd  Date  Time From   MsgID        To

  318 BF    847   0 13-Dec 0440 KD2EJ  28983_WB2QJA INFO
 Sb:TR-2400 NOISE PROBLEMS







PERMISSION GRANTED FOR RELAYING AS INDICATED ON KENWOOD BBS.





SB-809



TR-2400 Unwanted Noise:Tone or burst at tx                        2-13-80





For complaints of a tone burst type noise, or simply a noise, at initial

key down, suspect either a broken losse component, or incorrect valued

component on the RX TX  unit.



On the RX TX unit, Q16 emitter, check C82, a 33 uf tantalum cap for broken

connection.



If you find a 22 uf cap at C82 replace it with a 33 uf cap.



JEB/yn

© 21380TKC

=========================================================================

Note:I haven't tried or verified this, proceed at your own risk.  WA2ISE



copied from packet:

 Msg# TSF  Size #Rd  Date  Time From   MsgID        To

  317 BF   1183   0 13-Dec 0443 KD2EJ  28984_WB2QJA INFO
 Sb:TR-2400 DISPLAY & KEYBOARD







PERMISSION GRANTED FOR RELAYING AS INDICATED ON KENWOOD BBS.



SB-810



TR-2400 Display or Keyboard trouble                        2-20-80





Display



An intermittent or blank digit may be caused by either a broken lead, or

intermittently shorting lead on the PLL unit.



On the PLL unit, look in the area of Q12, the touchtone generator.  Between

Q12 and the board edge locate the D1-D4 lines.  Inspect this area for

either an open (Broken) lead, or shorted (pinched) lead.  Repair as

necessary, and check lead dress before reassembly.



Keyboard



An intermittent or inoperative keyboard row or column may be caused by a

torn or pinched lead, or a cracked diode.



Again, in the area of Q12, inspect the "T" and "Y" lines for shorts or open

connections, and inspect diodes D19-D26 for physical breakage.



JEB/yn

© 22080TKC

=========================================================================

Note:I haven't tried or verified this, proceed at your own risk.  WA2ISE



copied from packet:

 Msg# TSF  Size #Rd  Date  Time From   MsgID        To

  316 BF   1108   0 13-Dec 0446 KD2EJ  28986_WB2QJA INFO
 Sb:TR-2400 RX LOW & DISTORTION



PERMISSION GRANTED FOR RELAYING AS INDICATED ON KENWOOD BBS.



SB-811



TR-2400 RX low, INtermittent, or distorted                        2-20-80



For any of the above complaints, suspect a broken loose component in the RX

IF or audio output circuit on the RX TX unit.  Simply pull up on the leads

and resolder.



Adjacent to Q9, the audio output IC, find C49, a 1uf cap.  If broken loose

from the board, audio output may be down, while current consumption may be

up from the normal 30mA to about 100mA due to the audio output amp

oscillating.



Adjacent to L10, the discriminator, locate C33, a .033uf cap.  If this

component is broken loose, audio output may be up approximately 6 dB with

excessive high frequency audio response.



JEB/yn

© 22080TKC

=========================================================================

Note:I haven't tried or verified this, proceed at your own risk.  WA2ISE






SOURCE: The QRZ Windows Ham Radio CDROM



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